Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mossbauer spectroscopy
Ivanovski, Valentin N.
Jokić, Bojan M.
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A composite powder Li2FeSiO4/C is synthesized through a solid state reaction at 750 C. The Rietveld crystal structure refinement is done in the monoclinic P2(1)/n space group. It is found that the crystal structure is prone to antisite defect where small part of iron ion occupies exclusively Li(2) crystallographic position, of two different lithium tetrahedral positions (Li(1) and Li(2)). This finding is also confirmed by Mossbauer spectroscopy study: the sextet evidenced in the Mossbauer spectrum is assigned to the iron ions positioned at the Li(2) sites. A bond-valence energy landscape calculation is used to predict the conduction pathways of lithium ions. The calculations suggest that Li conductivity is two-dimensional in the (101) plane. Upon galvanostatic cyclings the structure starts to rearrange to inverse,311 polymorph. (C) 2014 Elsevier B.V. All rights reserved.
Keywords:Lithium iron silicate (Li2FeSiO4) / Cathode material / Rietveld X-ray refinement / Mossbauer spectroscopy / Bond-valence energy landscape
Source:Journal of Power Sources, 2014, 265, 75-80
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